Topology freezes or slows down due to java.util.concurrent.TimeoutException

Possibly a Bug in distributed datastore or other offset-0 component.

This is a Boron regression in Singlepeer Changecount suite. Symptoms are slightly different in "mixed" job [0] (topology practically freezes) and in "non-mixed" job [1] (topology only slows down).

The TimeoutException occures in karaf.log, followed by several other ERRORs. This does not happen in Prefix Count suite (or anywhere in Beryllium tests).

Segments of logs will be attached, as the whole logs are very big and even the segments take too many lines to paste here. Both segments end with two occurences of "raced with transacion PingPongTransaction" error, in the real logs there were many more of such occurrences.

[0] https://jenkins.opendaylight.org/releng/view/bgpcep/job/bgpcep-csit-1node-periodic-bgp-ingest-mixed-only-boron/
[1] https://jenkins.opendaylight.org/releng/view/bgpcep/job/bgpcep-csit-1node-periodic-bgp-ingest-only-boron/